Sitemap not working

I uploaded the directory and files exactly as per instructions:

/all-in-one-seo-pack/ – goes in /wp-content/mu-plugins

all_in_one_seo_pack.php – goes in /wp-content/mu-plugins

simple-sitemaps.php – goes in /wp-content/mu-plugins

sitemap.php – goes in /wp-content

Yes, sitemap.php is in wp-content and not in mu-plugins. Since it is not generating a file named sitemap.xml in the root, I wonder if the error is in my htaccess file?

Instructions said: Add the following to your .htaccess under the line that handles uploaded files:

RewriteRule ^(.*/)?sitemap.xml wp-content/sitemap.php [L]

Here is my .htaccess file content:

RewriteEngine On

RewriteBase /

#uploaded files

RewriteRule ^(.*/)?files/$ index.php [L]

RewriteCond %{REQUEST_URI} !.*wp-content/plugins.*

RewriteRule ^(.*/)?files/(.*) wp-content/blogs.php?file=$2 [L]

RewriteRule ^(.*/)?sitemap.xml wp-content/sitemap.php [L]

# add a trailing slash to /wp-admin

RewriteCond %{REQUEST_URI} ^.*/wp-admin$

RewriteRule ^(.+)$ $1/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]

RewriteCond %{REQUEST_FILENAME} -d

RewriteRule . – [L]

RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-.*) $2 [L]

RewriteRule ^([_0-9a-zA-Z-]+/)?(.*.php)$ $2 [L]

RewriteRule . index.php [L]

php_value memory_limit 32M

php_flag display_errors On

<IfModule mod_security.c>

<Files async-upload.php>

SecFilterEngine Off

SecFilterScanPOST Off



Options -MultiViews

ErrorDocument 404 //27480.php

Any suggestions?